The limits of Oracle ADVM and these discussed in this section.
The default configuration for an Oracle ADVM volume is 8 columns and a 1 MB stripe width. The volume extent size is 8 megabytes (MB) if the disk group allocation unit (AU) is less than or equal to 8 MB. If the AU size is greater than 8 MB, then the Oracle ADVM volume extent size is equivalent to the disk group AU size.
Oracle ADVM writes data as 1 megabyte (MB) stripe chunks in round robin fashion to each column and fills a stripe set of eight 8 MB extents with 64 stripe chunks before moving to a second stripe set of eight 8 MB extents for volumes greater than 64 MB. Setting the number of columns on an Oracle ADVM dynamic volume to 1 effectively turns off striping for the Oracle ADVM volume.
On Linux platforms Oracle ASM Dynamic Volume Manager (Oracle ADVM) volume devices are created as block devices regardless of the configuration of the underlying storage in the Oracle ASM disk group. Do not use raw (8) to map Oracle ADVM volume block devices into raw volume devices.
For information about ASMCMD commands to manage Oracle ADVM volumes, refer to Managing Oracle ADVM with ASMCMD .